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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense $ 9.2 $ 15.1
Total share-based compensation expense 9.5 15.1
Tax impact [1] (2.1) (3.7)
Reduction in net income 7.4 11.4
Employee Stock Options, Restricted Stock and Restricted Share Units [Member]    
Share-Based Compensation Expense [Line Items]    
Impact of accelerated vesting on equity awards [2] 0.3 0.0
Stock Options    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 3.6 6.8
Restricted Share Units and Other Share-based Compensation    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 4.8 6.7
Share Appreciation Rights (SARs)    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense $ 0.8 $ 1.6
[1]
Represents the income tax benefit recognized in the statements of operations for share-based compensation arrangements.
[2]
Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.